I have always thought of forum posting as beneficial to the community it's niched in, beneficial to me as a knowledge base, and now more so than ever (and we can see this by the increase of spam on our forums) it's a great place to market your sites. And one great way to make sure your posts become the "hot topic" amoung the many other great threads you'll find is the creative use of link baiting your thread titles. For example, I recently wrote a thread post titled, "Some Say, 'Forget Google!'" - and as you know with the tidal wave that they have created lately with site penalties (PR drops) - people want to express their very passionate opinions on those types of threads. So it's a good way to make sure your posts generate allot of interest.